Definition of trough in English:

noun

Fence off all rivers and streams and provide piped mains water to drinking troughs.

This was made from a split log, which sometimes reached a vast size; although anthropological studies have shown that the larger ones may have also been used to lay-out bodies, or as water troughs for animals.

The crest of the undulation on the inside of the wall coincides with the trough of the Gaussian vault.

This paper deals with the development of probability density functions applicable for peaks, troughs and peak-to-trough excursions of a non-Gaussian random process where the response of a non-linear system is represented in the form of Volterra's second-order functional series.

Settlement troughs both over single and twin tunnels (when symmetric) can often be described by a Gaussian curve.

Origin

Late Old English trīg is from the Germanic base of tree (Old English). The primary sense may have been ‘wooden container’. Trough (Old English) had a primary meaning of ‘wooden vessel’ and is related. The notion of a downturn on a graph or similar representation dates from the late 19th century in meteorology, the early 20th century in economics, and generally (peaks and troughs) from the 1930s.